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研制了一种大功率活塞射流激励器,出口瞬时速度峰值可达0.3 Hz,通过对活塞激励器射流流场测量,得到激励器出口流场速度、涡量分布,分析得到激励器合成射流流动结构与特征,通过采用活塞激励器控制同轴射流掺混,实验结果证明此种活塞激励器可以用于相对较高的速度流场的主动流动控制.利用提出的设计方法设计合成射流激励器可以在激励器出口形成稳定的对涡结构,采用一定的激励频率即可对喷管气流掺混进行有效控制.研究表明,合成射流激励器作为主动流动的执行机构,在航空动力排气系统具有潜在的重要价值.
A high-power piston jet actuator was developed, whose instantaneous peak value of outlet velocity can reach 0.3 Hz. By measuring the jet flow field of the piston driver, the velocity and vorticity distribution at the outlet of the actuator were obtained. The experimental results show that this kind of piston exciter can be used for active flow control of relatively high velocity flow field.The design of synthetic jet exciter with the proposed design method can be used in The outlet of the actuator forms a stable vortex structure and the jet flow mixing can be controlled effectively by a certain excitation frequency.The research shows that the synthetic jet actuator as the actuator of active flow has the potential in the aerodynamic exhaust system Important value.